Mouth-piece for telephones



(No Model.)

R. W. WHITNEY & B. K. COWLES.

MOUTH PIECE FOR TELBPHONBS. No. 421,800- Patented Feb. 18, 1890.

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UNITED STATES PATENT OFFICE;

RUEL \V. IVHITNEY AND BYRON K COWVLES, OF SAN FRANCISCC, CALIFORNIA.

MOUTH-PIECE FOR TELEPHONES.

SPECIFICATION forming part of Letters Patent No. 421,800, dated February 18, 1890.

Application filed October 2,1888. Serial No. 287,018- A (No model.)

To aZZ whom it may concern.-

Be it known that we, RUEL W. WHITNEY and BYRON K. CowLEs, citizens of the United States, residing at San Francisco, in the county of San Francisco, State of California, have invented certain new and useful Improvements in Mouth-Pieces for Telephones, of which the following is a specification, reference being had therein to the accompanying drawings.

Similar figures refer to similar parts throughout the several views.

Figure 1 shows the holder and mouthpiece in place on a telephone-transmitter. Fig. 2 shows the holder-tube with its supportingwire and the mouth-piece detached. Fig. 3 is an end view of the holder, showing the gauze diaphragm.

The object of our invention is to concentrate the voice upon the diaphragm of the telephone. \Ve are aware that several devices have been patented for this purpose, but none that can be manufactured as cheaply as ours. In a former patent granted to R.\V.\Vl1itney and Frederick Pultz a tube was used for this purpose in which was contained a perforated screen seated in an annular groove, the object, as. then stated, being to form an airchamber between it and the diaphragm of the telephone. Experience has demonstrated that, while the invention was a great improvement over anything heretofore used, the use of an air-chamber was entirely unnecessary.

The object of our present invention. is to conduct the voice as nearly to the diaphragm of the telephone-transmitter through a tube as possible; but in experimenting we have demonstrated that an open tube, while it centers the voice upon the diaphragm, does so with too much force, and the vibrations become confused and in distinct, especially when talking very loud. To avoid this and yet convey the voice to the telephonediaphragm direct, and yet not with too much force, we have placed the holder of the tube in close proximity to the diaphragm and have placed a wire-netting 4 on the end of the holder to prevent the too forcible entrance of the the two making, when screwed together, a close connection. WVe do not use the wirenetting in the tube, but at the end of the holder of the tube, in order that it may come voice. Into this holder .we place a tube 3,

as close to the telephone-diaphragm as possisound will not pass through may be seen by holding it before the mouth and blowing through it. It will thus be seen that the end sought for has been attained.

The holder is made of thin metal and the outer edge is turned down or over to fit into the turned groove in the door of the transmitter, as shown at 1, and is attached to the telephone by a single wire 2.

\Ve are aware that this manner of attaching transmitters is not new where two wires are used; but we do not know of any that attach by a single wire by springing it upon the transmitter.

Having described our invention in full, what we desire to secure by Letters Patent of the United States isv l. A tubular holder for telephone HlOllllll. pieces, screw-threaded for the purpose of receiving a mouth-piece, and having on its inner end a gauze wire-netting to prevent the too forcible sound of the voice passing through.

2. A holder having two arms for the purpose of clasping a telephone-box, said holder being screw-threaded to receive a mouthpiece or tube and having on its inner end a gauze wire-netting, and a tube or'1nouth-piece screw-threaded to connect with the holder, substantially as and for the purpose set forth.

I11 testimony whereof we aiiiX our signaturcs in presence of two witnesses.

RUEL 'W. WHITNEY. BYRON K. COVVLES.

Witnesses:

HENRY M. MCGILL, J EDWIN GRANT. 

